/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.mode.metadata.refresher.pushdown;

import org.apache.shardingsphere.database.connector.core.type.DatabaseType;
import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
import org.apache.shardingsphere.infra.metadata.database.resource.ResourceMetaData;
import org.apache.shardingsphere.infra.metadata.database.resource.unit.StorageUnit;
import org.apache.shardingsphere.infra.route.context.RouteMapper;
import org.apache.shardingsphere.infra.route.context.RouteUnit;
import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
import org.apache.shardingsphere.mode.metadata.refresher.util.SchemaRefreshUtils;
import org.apache.shardingsphere.mode.persist.service.MetaDataManagerPersistService;
import org.apache.shardingsphere.sql.parser.statement.core.statement.SQLStatement;
import org.apache.shardingsphere.test.infra.framework.extension.mock.AutoMockExtension;
import org.apache.shardingsphere.test.infra.framework.extension.mock.StaticMockSettings;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;

import java.sql.SQLException;
import java.util.Collections;
import java.util.Optional;
import java.util.Properties;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@ExtendWith(AutoMockExtension.class)
@StaticMockSettings({TypedSPILoader.class, SchemaRefreshUtils.class})
class PushDownMetaDataRefreshEngineTest {
    
    private final DatabaseType databaseType = TypedSPILoader.getService(DatabaseType.class, "FIXTURE");
    
    @Mock
    private MetaDataManagerPersistService metaDataManagerPersistService;
    
    @Mock
    private ShardingSphereDatabase database;
    
    @Mock
    private SQLStatementContext sqlStatementContext;
    
    @Test
    void assertIsNeedRefreshWhenRefresherAbsent() {
        SQLStatement sqlStatement = new SQLStatement(databaseType);
        when(sqlStatementContext.getSqlStatement()).thenReturn(sqlStatement);
        when(TypedSPILoader.findService(PushDownMetaDataRefresher.class, sqlStatement.getClass())).thenReturn(Optional.empty());
        when(TypedSPILoader.findService(PushDownMetaDataRefresher.class, sqlStatement.getClass().getSuperclass())).thenReturn(Optional.empty());
        assertFalse(new PushDownMetaDataRefreshEngine(sqlStatementContext).isNeedRefresh());
    }
    
    @SuppressWarnings("unchecked")
    @Test
    void assertIsNeedRefreshWhenRefresherFound() {
        SQLStatement sqlStatement = new SQLStatement(databaseType);
        when(sqlStatementContext.getSqlStatement()).thenReturn(sqlStatement);
        PushDownMetaDataRefresher<SQLStatement> refresher = mock(PushDownMetaDataRefresher.class);
        when(TypedSPILoader.findService(PushDownMetaDataRefresher.class, sqlStatement.getClass())).thenReturn(Optional.of(refresher));
        assertTrue(new PushDownMetaDataRefreshEngine(sqlStatementContext).isNeedRefresh());
    }
    
    @SuppressWarnings("unchecked")
    @Test
    void assertRefreshUsesStorageUnitTypeAndLogicDataSource() throws SQLException {
        when(SchemaRefreshUtils.getSchemaName(database, sqlStatementContext)).thenReturn("foo_schema");
        SQLStatement sqlStatement = new SQLStatement(databaseType);
        when(sqlStatementContext.getSqlStatement()).thenReturn(sqlStatement);
        StorageUnit storageUnit = mock(StorageUnit.class);
        DatabaseType storageType = mock(DatabaseType.class);
        when(storageUnit.getStorageType()).thenReturn(storageType);
        ResourceMetaData resourceMetaData = mock(ResourceMetaData.class);
        when(resourceMetaData.getStorageUnits()).thenReturn(Collections.singletonMap("actual_ds", storageUnit));
        when(database.getResourceMetaData()).thenReturn(resourceMetaData);
        ConfigurationProperties props = new ConfigurationProperties(new Properties());
        PushDownMetaDataRefresher<SQLStatement> refresher = mock(PushDownMetaDataRefresher.class);
        new PushDownMetaDataRefreshEngine(sqlStatementContext, refresher).refresh(
                metaDataManagerPersistService, database, props, Collections.singleton(new RouteUnit(new RouteMapper("logic_ds", "actual_ds"), Collections.emptyList())));
        verify(refresher).refresh(metaDataManagerPersistService, database, "logic_ds", "foo_schema", storageType, sqlStatement, props);
    }
    
    @SuppressWarnings("unchecked")
    @Test
    void assertRefreshUsesStatementDatabaseTypeWhenRouteUnitsAbsent() throws SQLException {
        when(SchemaRefreshUtils.getSchemaName(database, sqlStatementContext)).thenReturn("foo_schema");
        SQLStatement sqlStatement = new SQLStatement(databaseType);
        when(sqlStatementContext.getSqlStatement()).thenReturn(sqlStatement);
        ConfigurationProperties props = new ConfigurationProperties(new Properties());
        PushDownMetaDataRefresher<SQLStatement> refresher = mock(PushDownMetaDataRefresher.class);
        new PushDownMetaDataRefreshEngine(sqlStatementContext, refresher).refresh(metaDataManagerPersistService, database, props, Collections.emptyList());
        verify(refresher).refresh(metaDataManagerPersistService, database, null, "foo_schema", databaseType, sqlStatement, props);
    }
}
